US6747926B1 - Method for regulating a rotational speed - Google Patents

Method for regulating a rotational speed Download PDF

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Publication number
US6747926B1
US6747926B1 US10/031,316 US3131602A US6747926B1 US 6747926 B1 US6747926 B1 US 6747926B1 US 3131602 A US3131602 A US 3131602A US 6747926 B1 US6747926 B1 US 6747926B1
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United States
Prior art keywords
data
storage medium
outermost
disc
track
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
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US10/031,316
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English (en)
Inventor
Sven Potrykus
Dietmar Uchtmann
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Robert Bosch GmbH
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Robert Bosch GmbH
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Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: POTRYKUS, SVEN, UCHTMANN, DIETMAR
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/28—Speed controlling, regulating, or indicating
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/24—Arrangements for providing constant relative speed between record carrier and head
    • G11B19/247—Arrangements for providing constant relative speed between record carrier and head using electrical means

Definitions

  • Drives of compact disc players designed in this way are usually operated in an operating mode with a constant linear speed.
  • the rotational speed is regulated so that a continuous data stream is read out at a constant amount of data per unit of time, i.e., at a constant linear speed.
  • the constant linear speed is limited in particular by the tracking of the reader device over data tracks of the compact disc and by the processing capacity of the playback device for analysis of the digital audio data read out from the data tracks on the compact disc.
  • the rotational speed In the case of jumping tracks in the constant linear speed operating mode, the rotational speed must be adjusted as a function of the position of the reader device in order to maintain a constant amount of data per unit of time in reading out the digital audio data from the data tracks of the compact disc. However, the rate of access to data in the case of jumping tracks is reduced by the time required for adjustment of the rotational speed.
  • the method according to the present invention has the advantage over the related art that the rotational speed in playing back the disc-shaped storage medium is kept constant. In this way, the playback device is operated in a constant angular speed operating mode. In jumping tracks in the constant angular speed operating mode, it is not necessary to adjust rotational speed to control the amount of data read out per unit of time so that a higher access rate to data in the data tracks can be achieved when jumping tracks.
  • an outermost data track of the disc-shaped storage medium which is opposite the axis of rotation and has been written with useful data is determined; a value is obtained for the amount of data stored in the outermost data track; the rotational speed is adjusted as a function of the amount of data thus determined and a data transfer rate, the data transfer rate indicating a maximum amount of data that can be read out by the playback device per unit of time, so that the useful data stored in the outermost data track can be read out at the data transfer rate when playing back the disc-shaped storage medium.
  • the rotational speed of the respective disc-shaped storage medium is adjusted as a function of the data structure stored on the storage medium or the arrangement of data tracks having useful data on the storage medium.
  • the rotational speed for each storage medium can be adjusted so that the maximum possible amount of data read out for this storage medium can be utilized per unit of time as a function of the data structure stored on the respective storage medium.
  • An especially simple method of determining the outermost data track is by analysis of content data in a lead-in area of the disc-shaped storage medium.
  • An especially accurate method of determining the value for the amount of data stored in the outermost data track is obtained by track jumping by the reader device of the playback device to this data track, by reading out the useful data from this data track and by measuring the number of useful data bits of this data track read out or by measuring the time required for this readout operation at a given constant linear speed in data readout.
  • FIG. 1 shows a block diagram of a playback device.
  • FIG. 2 shows flow charts for five different designs of the method according to the present invention for adjusting a rotational speed.
  • FIG. 1 shows a playback device 10 for playing back a disc-shaped storage medium 1 .
  • This disc-shaped storage medium 1 may be, for example a magnetic storage disc, an optical storage disc or a magneto-optic storage disc.
  • storage medium 1 When storage medium 1 is designed as an optical storage disc, it may be, for example, a compact disc, a CD ROM, a digital video disc (DVD), a mini-disc, or the like.
  • Playback device 10 is then designed accordingly as a drive for magnetic, optical or magneto-optical storage discs.
  • playback device 10 is designed as a drive for optical storage discs, it may be, for example, a compact disc player, a CD ROM drive, a drive for digital video discs, a drive for mini-discs, or the like.
  • Storage medium 1 is designed in the form of a circular disc which sits concentrically with an axis 5 of rotation on a turntable 40 which can be driven by a motor 45 so that storage medium 1 can rotate about axis 5 of rotation.
  • Storage disc 1 is shown in cross section in FIG. 1 and has a rotation-symmetrical design with respect to axis 5 of rotation.
  • Storage medium 1 includes a central disc hole 65 in the disc to receive a pin 70 of turntable 40 for centering storage medium 1 on turntable 4 .
  • Next to central disc hole 65 there is a lead-in area 20 of storage medium 1 which stores the content data and/or address data of useful data stored on storage medium 1 .
  • lead-in area 20 may contain a total playback time, a number of music titles, playback times of the music titles and starting addresses of the music titles.
  • program area 30 storing useful data in a data track running in a spiral pattern concentrically with axis 5 of rotation.
  • the spiral data track can be considered here as approximately broken down into a plurality of data tracks concentric with axis 5 of rotation.
  • the useful data may be in the form of digital audio data.
  • storage medium 1 is designed as a digital video disc
  • the useful data may be in digital form.
  • the useful data may be in the form of program data.
  • program area 30 there is a lead-out area 35 which does not generally store any useful data.
  • the content data and/or address data in lead-in area 20 is stored in the one spiral-shaped data track of storage medium 1 . Therefore, this data track can also be thought of as broken down into multiple data tracks concentric with axis 5 of rotation in lead-in area 20 .
  • a reader device 25 moves radially over lead-in area 20 and program area 30 away from axis 5 of rotation for readout of data from storage medium 1 . Reader device 25 reads data out of storage medium 1 and sends it to a decoder 55 .
  • FIG. 1 shows only the elements of playback device 10 which are essential for implementation of the method according to the present invention.
  • storage medium 1 In a playback operating mode, storage medium 1 is to be moved rotationally about axis 5 of rotation by reader device 25 at a constant rotational speed for readout of useful data in program area 30 . Assuming the useful data has been stored at a constant linear recording speed of 1.2 m/s, for example, in program area 30 , then the amount of data read out of the data tracks per unit of time in playback operating mode will be greater at an outer edge 75 of program area 30 opposite axis 5 of rotation than is the case in readout of data from data tracks of program area 30 closer to axis 5 of rotation. The rotational speed of storage medium 1 is thus limited by the maximum allowed amount of data for readout per unit of time at outer edge 75 of program area 30 .
  • the data transfer rate is limited from a mechanical standpoint by the trackability of reader device 25 over the data tracks of storage medium 1 in particular, and from the standpoint of information technology, it is limited by the speed in analysis of data by analyzer unit 60 .
  • a constant rotational speed of storage medium 1 in playback operating mode is then selected so that the useful data stored in an outermost data track 15 of program area 30 of storage medium 1 , opposite axis 5 of rotation, can be read out at the data transfer rate in playback of storage medium 1 .
  • the data transfer rate is not utilized fully in reading out data tracks that are located closer to axis 5 of rotation than outermost data track 15 .
  • outermost data track 15 At least for outermost data track 15 , outermost data track 15 and the amount of data stored in it must first be determined in analyzer unit 60 . The rotational speed can then be adjusted by motor controller 50 as a function of the data transfer rate and the amount of data thus determined in outermost data track 15 .
  • outermost data track 15 is arranged at the boundary between program area 30 and lead-out area 35 , i.e., at outer edge 75 .
  • outermost data track 15 may also be located in program area 30 , closer to axis 5 of rotation.
  • outermost data track 15 is the outermost data track in program area 30 of storage medium 1 which has been written with useful data and is opposite axis 5 of rotation and is thus the outermost data track of storage medium 1 itself which has been written with useful data and is opposite axis 5 of rotation.
  • Outermost data track 15 can be determined by analysis of the content data and/or address data read out of lead-in area 20 .
  • the distance of outermost data track 15 from axis 5 of rotation can be determined from the total playback time of storage medium 1 , which is optionally stored in the lead-in area, or by calculating it by using the address data and/or content data from lead-in area 20 for playback of useful data on storage medium 1 of 1.2 m/s, for example, and a given distance between adjacent data tracks of 1.6 ⁇ m, for example.
  • the amount of data stored in outermost data track 15 can then also be determined. When this amount of data is divided by the data transfer rate and then the inverse is formed, this yields the desired constant rotational speed for the playback operating mode.
  • the constant linear speed in recording can also be measured.
  • the constant linear speed in recording indicates the data track length required for storage of useful data for playback in one second of playback time. This can be determined by reader device 25 reading out precisely one given data track having a known radius with respect to axis 5 of rotation and analyzer unit 60 determining how long the playback time is for playback of the given data track. Dividing the size of the given data track, which can be calculated on the basis of the known radius, by the playback time determined in analyzer unit 60 for data read out from the given data track, yields the constant linear speed in recording.
  • the amount of data stored in outermost data track 15 can also be determined more accurately by reader device 25 jumping tracks to this outermost data track 15 and reads out the useful data stored there.
  • Analyzer unit 16 can then determine the amount of data of the useful data thus read out. Then by dividing the amount of data thus determined by the data transfer rate and next forming the inverse value, as described above, it is possible to determine the desired rotational speed for playback of storage medium 1 in the playback operating mode.
  • the amount of data of outermost data track 15 can also be determined by reader device 25 jumping tracks to outermost data track 15 and reading it out at a predetermined constant linear data reading speed. Then in analyzer unit 60 , the time required for readout of useful data from outermost data track 15 is determined. The amount of data of useful data in outermost data track 15 is then determined from the data track length calculated by multiplying the given constant linear data reading speed by the time determined in analyzer unit 60 , assuming that the amount of data stored per unit of data track length is known and given. Then the desired rotational speed for playback operating mode is again calculated from the calculated amount of data and the data transfer rate by the method described above.
  • FIG. 2 shows flow charts for five different possibilities for determining the constant rotational speed for playback operating mode.
  • the same reference notation denotes the same program points here.
  • FIG. 2 ( a ) A first possible embodiment is illustrated in FIG. 2 ( a ).
  • motor controller 50 causes motor 45 to drive turntable 40 at a first preset constant rotational speed. Then the procedure branches off to a second program point 110 .
  • analyzer unit 60 checks on whether a storage medium. 1 has been placed in playback device 10 . If this is the case, then the program branches off to a third program point 115 ; otherwise it branches back to second program point 110 .
  • the content data and/or address data is read out of lead-in area 20 by reader device 25 . Then the program branches off to a fourth program point 120 .
  • analyzer unit 60 checks on whether readout of data from lead-in area 20 is concluded. If this is the case, the program branches off to a fifth program point 145 ; otherwise, it branches back to third program point 115 .
  • a second constant rotational speed for the playback operating mode of motor controller 50 is set on motor 45 for driving turntable 40 , under the assumption of a given constant linear recording speed of 1.2 m/s, for example, and a given distance of 1.6 ⁇ m, for example, between adjacent data tracks in the manner described above, taking into account the data transfer rate, motor controller 50 being driven accordingly by analyzer unit 60 which analyzes the content data and/or address data from lead-in area 20 and calculates the second constant rotational speed as described above. Then the program is exited.
  • FIG. 2 ( b ) a second flow chart is shown in FIG. 2 ( b ).
  • This flow chart corresponds to the flow chart shown in FIG. 2 ( a ) up to and including fourth program step 120 .
  • fourth program point 120 After fourth program point 120 , it branches off to a sixth program point 130 for a “yes” decision according to FIG. 2 ( b ); otherwise, it branches back to third program point 115 .
  • analyzer unit 60 performs a measurement of the constant linear recording speed in the manner described previously. Then it branches off to a seventh program point 150 .
  • analyzer unit 60 calculates the second constant rotational speed for the playback operating mode in the same manner as that used at fifth program point 145 , but the given value of 1.2 m/s, for example, is no longer used for the constant linear recording speed, but instead the value measured in analyzer unit 60 is used, so the determination of the second constant rotational speed in the embodiment according to FIG. 2 ( b ) is more accurate.
  • the program is exited after seventh program point 150 .
  • FIG. 2 ( c ) shows a third embodiment of the method according to the present invention.
  • This third embodiment corresponds in its flow chart to the flow charts shown in FIGS. 2 ( a ) and 2 ( b ), up to and including second program point 110 .
  • the program branches off for a “no” decision, back to second program point 110 , and in the case of a “yes” decision, it branches directly (i.e., without readout and analysis of the content data and/or address data stored in lead-in area 20 ) to sixth program point 130 , and the constant linear recording speed is measured as described above. Then it branches off to an eighth program point 155 .
  • the second constant rotational speed for the playback operating mode is determined by assuming that outermost data track 15 is arranged on outer edge 75 of program area 30 according to FIG. 1, the distance of this outer edge 75 from axis 5 of rotation being known in analyzer unit 60 on the basis of the given arrangement of lead-in area 20 , program area 30 and lead-out area 35 on disc-shaped storage medium 1 . Then the second constant rotational speed for the playback operating mode is determined in analyzer unit 60 from outermost data track 15 thus assumed and the measured constant linear recording speed, and motor 45 is controlled by motor controller 50 accordingly to adjust this rotational speed. The program is exited after eighth program point 155 .
  • FIG. 2 ( d ) a fourth embodiment of the method according to the present invention is shown.
  • the flow chart according to FIG. 2 ( d ) corresponds to the flow charts described previously according to FIGS. 2 ( a ) through 2 ( c ).
  • the program branches off from second program point 110 to a ninth program point 125 , and in the case of a “no” decision, it branches back to second program point 110 .
  • reader device 25 jumps to outermost data track 15 of disc-shaped storage medium 1 , which has been written with useful data and is opposite axis 5 of rotation, this outermost data track 15 being located in program area 30 of disc-shaped storage medium 1 . Then in the manner described above, analyzer unit 60 determines the amount of data in outermost data track 15 at a tenth program point 135 . By using the amount of data determined in tenth program point 135 and the data transfer rate, analyzer unit 60 calculates the second constant rotational speed for the playback operating mode in the manner described above and controls motor 45 over motor controller 50 to adjust this second constant rotational speed in a subsequent eleventh program point 160 . Then the program is exited.
  • FIG. 2 ( e ) a flow chart for a fifth embodiment of the method according to the present invention is illustrated.
  • the program branches off to a twelfth program point 105 , and a given constant linear data reading rate for reading out the useful data from the data tracks of program area 30 is set.
  • the program branches off to second program point 110 .
  • second program point 110 a check is performed in the known manner to determine whether a storage medium 1 has been placed in playback device 10 . If this is the case, then the program branches off to ninth program point 125 ; otherwise, it branches back to second program point 110 .
  • the program branches off to a thirteenth program point 140 .
  • the time required for readout of outermost data track 15 by reader device 25 at a predetermined constant linear data reading speed is determined in analyzer unit 60 .
  • the program branches off to a fourteenth program point 165 .
  • analyzer unit 60 determines the amount of data stored in this outermost data track 15 from the time determined at the thirteenth program point 140 and the predetermined constant linear data reading rate for readout of the data from the outermost data track 15 , as described above.
  • Analyzer unit 60 then calculates the second constant rotational speed for the playback operating mode from the amount of data thus determined and the data transfer rate in the manner described above and controls motor 45 accordingly to set this rotational speed on turntable 40 by way of motor controller 50 . Then the program is exited.

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  • Rotational Drive Of Disk (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
US10/031,316 1999-07-16 2000-07-14 Method for regulating a rotational speed Expired - Fee Related US6747926B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19933419 1999-07-16
DE19933419A DE19933419C1 (de) 1999-07-16 1999-07-16 Verfahren zur Einstellung einer Drehzahl
PCT/DE2000/002339 WO2001006508A1 (de) 1999-07-16 2000-07-14 Verfahren zur einstellung einer drehzahl

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US (1) US6747926B1 (de)
EP (1) EP1203375B1 (de)
JP (1) JP2003505809A (de)
CN (1) CN1180423C (de)
DE (2) DE19933419C1 (de)
HU (1) HUP0201851A2 (de)
WO (1) WO2001006508A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160224096A1 (en) * 2013-09-09 2016-08-04 Seagate Technology Llc Mobile data storage device with power management

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Publication number Priority date Publication date Assignee Title
JPH0636289A (ja) 1992-07-14 1994-02-10 Matsushita Electric Ind Co Ltd Ｃｄ・ｒｏｍ装置
JPH0773590A (ja) 1993-08-31 1995-03-17 Victor Co Of Japan Ltd ディスク装置
US5425014A (en) 1991-07-25 1995-06-13 Teac Corporation Apparatus for constant angular velocity reading of constant linear velocity disks
JPH08235770A (ja) 1995-02-24 1996-09-13 Hitachi Ltd ディスク再生方法及び装置
US5805548A (en) * 1995-09-07 1998-09-08 Pioneer Electronic Corporation Information reading apparatus
JPH11110901A (ja) 1997-10-03 1999-04-23 Nec Home Electron Ltd ディスク装置における回転速度制御装置及び方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5703850A (en) * 1996-06-18 1997-12-30 Cirrus Logic, Inc. Data retrieval system and method within a constant angular velocity CD-ROM
US5870363A (en) * 1996-10-25 1999-02-09 Oak Technology, Inc. Optical disk motor servo and method for closed loop speed control

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5425014A (en) 1991-07-25 1995-06-13 Teac Corporation Apparatus for constant angular velocity reading of constant linear velocity disks
JPH0636289A (ja) 1992-07-14 1994-02-10 Matsushita Electric Ind Co Ltd Ｃｄ・ｒｏｍ装置
JPH0773590A (ja) 1993-08-31 1995-03-17 Victor Co Of Japan Ltd ディスク装置
JPH08235770A (ja) 1995-02-24 1996-09-13 Hitachi Ltd ディスク再生方法及び装置
US5805548A (en) * 1995-09-07 1998-09-08 Pioneer Electronic Corporation Information reading apparatus
JPH11110901A (ja) 1997-10-03 1999-04-23 Nec Home Electron Ltd ディスク装置における回転速度制御装置及び方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160224096A1 (en) * 2013-09-09 2016-08-04 Seagate Technology Llc Mobile data storage device with power management
US10942503B2 (en) 2013-09-09 2021-03-09 Seagate Technology Llc Mobile data storage device with predicted temperature management via command time delay

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Publication number Publication date
WO2001006508A1 (de) 2001-01-25
EP1203375A1 (de) 2002-05-08
JP2003505809A (ja) 2003-02-12
DE19933419C1 (de) 2000-12-14
CN1358308A (zh) 2002-07-10
DE50005710D1 (de) 2004-04-22
HUP0201851A2 (en) 2002-09-28
CN1180423C (zh) 2004-12-15
EP1203375B1 (de) 2004-03-17

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